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Photo: ja:User:Sanjo, Public domain via Wikimedia Commons
See this from the train going to Hakata from Nagasaki. Remains of a ringed-dugout settlement, dating back to the 3rd century BCE. The remains lie on the spacious hilly area over Kanzaki City and Yoshinogari-cho of Kanzaki-gun in the northeastern part of Saga. Remains of a ringed-dugout settlement presumably dating back to the 3rd century BCE were unearthed there, and excavation is still underway at the site. They are among the largest archaeological remains in Japan.
Yoshinogari is a large and complex Yayoi period archaeological site located in the town of Yoshinogari and city of Kanzaki in Saga Prefecture, Kyūshū, Japan. According to the Yayoi chronology established by pottery seriations in the 20th century, Yoshinogari dates back to between the 3rd century BC and the 3rd century AD. However, recent attempts to use absolute dating methods such as AMS radiocarbon dating have shown that the earliest Yayoi component of Yoshinogari dates back to before 400 BC.
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